Quote Originally Posted by ScarabEpic22 View Post
So you have a 7x crank reluctor? The 02-05 4.2L I6 motors do as well, but dont use their PCM as its basically a 4cyl PCM modded to run 6 cylinders and exhaust cam VVT. Id recommend using an 04-06 P12 PCM, run a Colorado I4 OS. At least then you can manipulate the tuning easier than with a 4cyl PCM. You have to use a V2 to tune them however.
Scarab,

Do you happen to have copy of a P12 tune? I opened up a copy of my '99 2.2L tune and realized that it also appears to not be too boost friendly from the fueling side of things. The fuel maps are load vs. RPM and not kPa vs. RPM (think this is the similar downfall of the P10 PCM's). Hopefully, the P12's use MAP.